Evaporative Emission Controls for On-Road Motor Vehicles
The California Air Resources Board (CARB) administers a program for reducing evaporative and refueling emissions from on-road motor vehicles. These reductions are accomplished using specific emission standards and test procedures.
Current Regulations & Test Procedures
- Regulations for controlling on-road motor vehicle evaporative and refueling emissions are set forth in Sections 1976 and 1978, title 13, California Code of Regulations. The regulation for establishing specifications for fill pipes and openings of motor vehicle fuel tanks is set forth in Sections 2235, title 13, California Code of Regulations. These regulations can be found online through Westlaw “California Code of Regulations” at Section 1976, Section 1978, and Section 2235.
- “California Evaporative Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles,” adopted August 5, 1999, last amended September 2, 2015. (PDF – 887K)
- “California Refueling Emission Standards and Test Procedures for 2001 and Subsequent Model Motor Vehicles,” adopted August 5, 1999, last amended September 8, 2015. (PDF – 200K)
- Specifications for Fill Pipes and Openings of 2015 and Subsequent Model Motor Vehicle Fuel Tanks,” adopted March 22, 2012. (PDF – 78K)
- Fuel fill pipe application (PDF - 81K)
- February 2019 Invitation for Public Comment
Preliminary draft 15-day changes to California Specifications for Fill Pipes and Openings of Motor Vehicle Fuel Tanks are available for public review. This is being submitted prior to the official public release of the 15-day changes, to get stakeholder feedback. Contact Jason Gordon for more information.
- Public Hearing: October 25, 2018
CARB's board adopted proposed amendments to California Code of Regulations title 13, section 2235 and the associated test procedure. These regulations relate to the CARB's requirements for automakers motor vehicle fill pipes.
- Follow-up to Tier 3
In 2015, the evaporative and refueling emission regulations were amended to adopt key elements of the federal Tier 3 regulations. For more information, refer to the Formal Rulemaking Document.
- Minor Revision to LEV III Evaporative Emission Regulation
This minor amendment, adopted by CARB on December 6, 2012, is a clarification of a LEV III carry-over provision applicable to vehicles certified to the optional zero-evaporative emission standards under LEV II. For more information, refer to the Formal Rulemaking Documents of the December 2012 rulemaking.
- LEV III Amendments
On March 22, 2012, the evaporative emission regulation was amended to introduce zero-evaporative emission standards for all vehicle classes, with full phase-in by model year 2022. Also, refueling test procedures were updated. For more information, refer to the Formal Rulemaking Documents of the March 2012 rulemaking.
- Emission Warranty Amendments
In 2010, the evaporative and refueling emission regulations were amended as part of the emission warranty information reporting and recall rulemaking, which repealed the originally approved reporting and recall requirements of 2007. For more information, refer to the formal rulemaking documents of the 2010 rulemaking and of the 2007 rulemaking.
- Plug-in Hybrid Electric Vehicle Amendments
In 2009, the evaporative and refueling emission regulations were amended to incorporate test procedures for plug-in hybrid-electric vehicles.
- Evaporative Test Procedure Streamlining Amendments
In 2006, CARB adopted technical amendments for streamlining the evaporative and refueling emission test procedures, without affecting the stringency of the existing emission standards.
- LEV II Amendments
In 1999, the evaporative emission standards were significantly reduced as part of the LEV II rulemaking.
- "California Evaporative Emission Standards and Test Procedures for 1978 Through 2000 Model Motor Vehicles," last amended August 5, 1999. (PDF - 200K)
- "California Evaporative Emission Standards and Test Procedures for 1978 and Subsequent Model Motor Vehicles," as last amended May 22, 1997. (PDF - 200K)
- "California Refueling Emission Standards and Test Procedures for 1998 Through 2000 Model Motor Vehicles," last amended August 5, 1999. (PDF - 100K)
- “Specifications for Fill Pipes and Openings of 1977 Through 2014 Model Motor Vehicle Fuel Tanks” (PDF - 614K)
- 1997 rulemaking on enhanced evaporative emission requirements for ultra-small volume manufacturers.
- 2003 minor amendments to the refueling emission requirements as part of the Heavy-Duty Gasoline Engines and Low-Emission Vehicle Rulemaking.